https://bugs.gentoo.org/808747

https://github.com/widelands/widelands/commit/316eaea
From: matthiakl <t-m.42@mailpost.spdns.org>
Date: Sat, 14 Aug 2021 19:24:08 +0200
Subject: [PATCH] Added missing direct incude (#5025)
--- a/src/network/bufferedconnection.h
+++ b/src/network/bufferedconnection.h
@@ -20,6 +20,7 @@
 #ifndef WL_NETWORK_BUFFEREDCONNECTION_H
 #define WL_NETWORK_BUFFEREDCONNECTION_H
 
+#include <map>
 #include <memory>
 #include <mutex>
 #include <thread>
